While high temperatures remain in the mid-90s, a dip in that jet stream will start sinking down from Canada. This will provide some energy for late-afternoon scattered thunderstorms Friday. Strong to severe thunderstorms are likely Saturday as a cold front presses into western Massachusetts. This front will break the heat wave dropping temperatures back to the lower-80s Sunday through Tuesday.

This is our 4th heat wave of the year for Bradley International, the Pioneer Valley's official climate station. Four heat waves in a year happens only about once every four years. A detailed breakdown of these records can be found on the CBS3 Pinpoint Weather Blog.